Nouveau - Mar 2015 - [Bug 82714] [G84] nouveau fails to properly initialize GPU

https://bugs.freedesktop.org/show_bug.cgi?id=82714

--- Comment #8 from Bruno <bonbons at sysophe.eu> ---
Created attachment 114731
  --> https://bugs.freedesktop.org/attachment.cgi?id=114731&action=edit
dmesg with 3.19 but runpm=0

Same kernel, kernel log starting at loading nouveau with `modprobe nouveau
debug=debug runpm=0` and running Xorg on top of it:

Xorg.0.log tail:
[   235.286]    ABI class: X.Org ANSI C Emulation, version 0.4
[   235.286] (II) Loading sub module "shadowfb"
[   235.286] (II) LoadModule: "shadowfb"
[   235.286] (II) Loading /usr/lib64/xorg/modules/libshadowfb.so
[   235.286] (II) Module shadowfb: vendor="X.Org Foundation"
[   235.286]    compiled for 1.16.4, module version = 1.0.0
[   235.286]    ABI class: X.Org ANSI C Emulation, version 0.4
[   235.286] (--) Depth 24 pixmap format is 32 bpp
[   235.294] (II) NOUVEAU(0): Channel setup complete.
[   257.296] (EE) NOUVEAU(0): [COPY] failed to allocate class.

Once Xorg is started system gets sluggish until it completely freezes (even
netconsole can't send more data). This kernel load was gathered via
netconsole
while the previous one was collected locally.
As system froze, I have no state information for Xorg.

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